Charge and spin density perturbation on iron atom due to osmium impurity in metallic iron

• Autorzy: Błachowski A. , Ruebenbauer K. , Żukrowski J.
• Konferencja: Proceedings of the All-Polish Seminar on Mössbauer Spectroscopy OSSM'04
• Języki publikacji: EN

Abstrakty

EN

Samples of natural alfa-Fe doped randomly with Os impurities up to about 9 at.% have been investigated by means of the 14.41 keV Mössbauer absorption spectroscopy of 57Fe vs. Os concentration and at room temperature. It has been found that the nearest neighbor single Os impurity reduces hyperfine magnetic field on the iron nucleus by 3.97 T, while the second neighbor single Os impurity decreases this field by 1.11 T. More distant impurities slightly increase iron hyperfine field. There are no discernible effects of the Os-Os interaction on the magnetic field seen by iron. On the other hand, the electron charge density on the iron nucleus is increased by the nearest neighbor Os atom as seen via changes in the isomer shift, i.e. via changes in the spectral shift. The second neighbor impurity has the opposite effect on the charge density. More distant impurities tend to decrease the charge density as well. The effect of the first and second neighbor impurities decreases with increasing overall Os concentration indicating some Os-Os interaction influencing a charge density of the conduction electrons seen on the iron nucleus.

Słowa kluczowe

EN

Mössbauer spectroscopy; charge and spin density; impurities in metal

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2004
• Tom: Vol. 49,suppl.3
• Strony: 67--70
• Opis fizyczny: Bibliogr. 8 poz., rys.

Twórcy

autor

Błachowski A.

• Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, 2 Podchorążych Str., 30-084 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Ruebenbauer K.

• Mössbauer Spectroscopy Division, Institute of Physics, Pedagogical University, 2 Podchorążych Str., 30-084 Kraków, Poland, Tel.: [phone], Fax: [phone]

autor

Żukrowski J.

• Solid State Physics Department, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30 A. Mickiewicza Ave., 30-059 Kraków, Poland

Bibliografia

• 1. Błachowski A, Ruebenbauer K, Żukrowski J (2004) Effect of Pd impurity on charge and spin density in metallic iron studied by Mössbauer spectroscopy. Phys Scripta (in print) (see preprint: www.ap.krakow.pl/psm/pdfewww.pdf)
• 2. Cieślak J, Dubiel SM (2003) Titanium-induced changes in the electronic structure of iron. J Alloys Compd 350:17−23
• 3. Dubiel SM, Zinn W (1983) Comparison of model predictions with the measured Fe-site spin- and charge-density changes in α-iron: Mössbauer-effect study of Fe1−xGex alloys. Phys Rev B 28:67−75
• 4. Hesse J, Rübartsch A (1974) Model independent evaluation of overlapped Mössbauer spectra. J Phys E: Sci Instrum 7:526−532
• 5. Ruebenbauer K (1981) 119Sn Mössbauer spectroscopy in the magnetically diluted Heusler-type systems. Institute of Nuclear Physics, Kraków, Poland. Report no 1133/PS
• 6. Ruebenbauer K, Birchall T (1979) A computer programme for the evaluation of Mössbauer data. Hyperfine Interact 7:125−133
• 7. Vincze I, Campbell IA (1973) Mössbauer measurements in iron based alloys with transition metals. J Phys F: Metal Phys 3:647−663
• 8. Zemèik T (1975) Progress in Mössbauer spectroscopy of metallic systems. In: Hrynkiewicz AZ, Sawicki JA (eds) Proc of the Int Conf on Mössbauer Spectroscopy, 25−30 August 1975, Kraków, Poland. Vol 2, pp 59−81